Removing and replacing a thermal sensor

You might need to replace a faulty thermal sensor. This sensor is used to detect the ambient temperature of the air that is coming into the enclosure.

Before you begin

DANGER

Multiple power cords. The product might be equipped with multiple AC power cords or multiple DC power cables. To remove all hazardous voltages, disconnect all power cords and power cables. (L003)

1. Refer to the system log for the location of the faulty sensor. The thermal sensors are located in drive bays 8 and 10.
2. Take the system offline, as described in Procedure: Powering off the system.
3. Disconnect both power cords.
4. Locate the latches on the left and right front corners of the enclosure.
5. Lift the lower edge of each latch to release the enclosure from the rack, and then slide the enclosure forward until the fan door is accessible.
   Important: To avoid a tipping hazard, do not pull the enclosure forward any farther than half-way.
   Important: If you encounter resistance while sliding the enclosure forward, ensure that there is adequate slack in cables in the cable management arm at the back of the enclosure.
6. To open the fan door, slide the two latches that are identified by blue touchpoints toward the back of the enclosure. Then, lift the front edge of the fan door, as shown in the following figure.

   

7. Label the drive or drive filler in drive bays 8 and 10, and then remove them, as described in Removing and replacing a drive and Removing and replacing a drive slot filler.
8. The thermal sensors are attached to the floor of the drive bays by using adhesive, as shown in the following figure.

   

9. Remove the fans that are next to the faulty sensor’s ribbon cable, as described in Removing and replacing an enclosure fan.
10. Remove the plastic fan guides next to the faulty sensor’s ribbon cable.
11. To disconnect the thermal sensor's ribbon cable from the enclosure midplane, pull forward on the tabs on either side of the cable connector to release the cable from the connector. Then, remove the sensor.
    You might need to deflect the data cables above the ribbon cable slightly to access the ribbon cable connector.
12. Lift the sensor from the floor of the drive bay and remove the faulty thermal sensor from the enclosure.
13. Making sure that the new thermal sensor is facing upwards, insert the ribbon cable through the drive bay and beneath the lower edge of the drive midplane.
14. Align the new sensor with its original location in the drive bay and press the sensor downwards to adhere it to the chassis.
15. To connect the ribbon cable to the connector on the enclosure midplane, insert the cable until it is fully seated and slide back the tabs on the connector to secure the cable.
16. Replace the plastic fan guides.
17. Replace the enclosure fans, as described in Removing and replacing an enclosure fan.
18. Replace the drives or drive fillers in their original locations, as described in Removing and replacing a drive or Removing and replacing a drive slot filler.
19. Slide the enclosure back into the rack until the latches on the enclosure engage with the rack.
20. Reconnect the two power cords.